Superconductivity in heavily boron-doped silicon carbide (2008)
Kriener, M., Muranaka, T., Kato, J., Ren, Z. A., Akimitsu, J., Maeno, Y.
The discoveries of superconductivity in heavily boron-doped diamond (C:B) in 2004 and silicon (Si:B) in 2006 renew the interest in the superconducting state of semiconductors. Charge-carrier doping...
Kametani, F., Polyanskii, A. A., Yamamoto, A., Jiang, J., Hellstrom, E. E., Gurevich, A., ...
In order to understand why the inter- and intra-granular current densities of polycrystalline superconducting oxypnictides differ by three orders of magnitude, we have conducted combined...
Lattice and Magnetic structures of PrFeAsO, PrFeAsO0.85F0.15 and PrFeAsO0.85 (2008)
Zhao, Jun, Huang, Q., De La Cruz, Clarina, Lynn, J. W., Lumsden, M. D., Ren, Z. A., ...
We use powder neutron diffraction to study the spin and lattice structures of polycrystalline samples of nonsuperconducting PrFeAsO and superconducting PrFeAsO0.85F0.15 and PrFeAsO0.85. We find that...
Hicks, C. W., Lippman, T. M., Huber, M. E., Ren, Z. A., Zhao, Z. X., Moler, K. A.
The recently-discovered iron oxypnictide family of superconductors, RFeAsO$_{1-x}$F$_y$, where $R$ is a rare earth, shows evidence that competing magnetism plays a key role in the superconductivity...
Ma, C., Zeng, L. J., Yang, H. X., Shi, H. L, Che, R. C., Liang, C. Y., ...
The structural properties of the ROFeM (R=La, Nd; M=As, P) materials have been analyzed by means of electron diffraction, high-resolution transmission-electron microscopy (TEM) and in-situ cooling...
Jaroszynski, J., Riggs, S. C., Hunte, F., Gurevich, A., Larbalestier, D. C., Beobinger, G. S., ...
The recent discovery of a new class of superconducting oxypnictides with high transition temperatures may have profound implications for understanding unconventional high-temperature...
Yamamoto, A., Polyanskii, A. A., Jiang, J., Kametani, F., Tarantini, C., Hunte, F., ...
Early studies have found quasi-reversible magnetization curves in polycrystalline bulk rare-earth iron oxypnictides that suggest either wide-spread obstacles to intergranular current or very weak...
Evidence for Supercurrent Connectivity in Conglomerate Particles in NdFeAsO1-d (2008)
Moore, J D, Morrison, K, Yates, K A, Caplin, A D, Yeshurun, Y, Cohen, L F, ...
Here we use global and local magnetometry and Hall probe imaging to investigate the electromagnetic connectivity of the superconducting current path in the oxygen-deficient fluorine-free Nd-based...
Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs (2008)
Matano, K., Ren, Z. A., Dong, X. L., Sun, L. L., Zhao, Z. X., Zheng, Guo-qing
Since the discovery of high transition-temperature (Tc) superconductivity in copper oxides two decades ago, continuous efforts have been devoted to searching for similar phenomenon in other...
Jia, Xiaowen, Liu, Haiyun, Zhang, Wentao, Zhao, Lin, Meng, Jianqiao, Liu, Guodong, ...
High resolution photoemission measurements have been carried out on non-superconducting LaOFeAs parent compound and various superconducting R(O1-xFx)FeAs (R=La, Ce and Pr) compounds. We found that...
Tarantini, C., Gurevich, A., Larbalestier, D. C., Ren, Z. A., Dong, X. L., Lu, W., ...
We present measurements of the temperature and field dependencies of the magnetization M(T,H) of Nd(O0.89F0.11)FeAs at fields up to 33T, which show that superconductivity with the critical...
Liu, Haiyun, Jia, Xiaowen, Zhang, Wentao, Zhao, Lin, Meng, Jianqiao, Liu, Guodong, ...
High resolution photoemission measurements have been carried out on non-superconducting SmOFeAs parent compound and superconducting Sm(O$_{1-x}$F$_x$)FeAs (x=0.12, and 0.15) compounds. The...
Lu, W., Yang, J., Dong, X. L., Ren, Z. A., Che, G. C., Zhao, Z. X.
Diamagnetic susceptibility measurements under high hydrostatic pressure (up to 1.03 GPa) were carried out on the newly discovered Fe-based superconductor LaO_{1-x}F_{x}FeAs(x=0.11). The transition...
Evidence for s-wave pairing from measurement on lower critical field in $MgCNi_3$ (2005)
Lu, X. F., Shan, L., Wang, Z., Gao, H., Ren, Z. A., Che, G. C., ...
Magnetization measurements in the low field region have been carefully performed on a well-shaped cylindrical and an ellipsoidal sample of superconductor $MgCNi_3$. Data from both samples show almost...
Shan, L., Liu, Z. Y., Ren, Z. A., Che, G. C., Wen, H. H.
The low temperature specific heat of the superconductor MgCNi$_3$ and a non-superconductor MgC$_{0.85}$Ni$_3$ is investigated in detail. An additional contribution is observed from the data of...
Ren, Z. A., Che, G. C., Ni, Y. M., Dong, C., Chen, H., Jia, S. L., ...
In this paper, the $Fe$-containing superconductors $Fe_{0.5}Cu_{0.5}Ba_2YCu_2O_{7+\delta}$, $Fe_{0.5}Cu_{0.5}BaSrYCu_2O_{7+\delta}$ and $Fe_{0.5}Cu_{0.5}Sr_2YCu_2O_{7+\delta}$ were successfully...
The mechanical relaxation study of polycrystalline MgCNi3 (2003)
Yao, Y. X., Ying, X. N., Huang, Y. N., Wang, Y. N., Ren, Z. A., Che, G. C., ...
The mechanical relaxation spectra of a superconducting and a non-superconducting MgCNi3 samples were measured from liquid nitrogen temperature to room temperature at frequency of kilohertz. There are...
Influence of Carbon Concentration on the Superconductivity in MgCxNi3 (2003)
Shan, L., Xia, K., Liu, Z. Y., Wen, H. H., Ren, Z. A., Che, G. C., ...
The influence of carbon concentration on the superconductivity (SC) in MgC$_{x}$Ni$_3$ has been investigated by measuring the low temperature specific heat combined with first principles electronic...
Superconducting Properties of Atomic-Disordered Compound MgCNi_3 (2002)
Karkin, A., Goshchitskii, B., Kurmaev, E., Ren, Z. A., Che, G. C.
The effect of radiation-induced disordering in a nuclear reactor (fast neutrons fluence \Phi = 5\cdot10^{19} cm^2, T_{\text{irr}} = 340 K) on resistivity \rho, superconducting transition temperature...
Effect of Mg and C contents in MgCNi3, and structure and superconductivity of MgCNi3-xCox (2001)
Ren, Z. A., Che, G. C., Jia, S. L., Chen, H., Ni, Y. M., Zhao, Z. X.
The effect of Mg and C contents on TC in MgCNi3, and structure and superconductivity of MgCNi3-xCox were studied. It is found that the excess of Mg and C in initial material mixture is favorable to...
Preparation and Superconductivity of a MgB2 Superconducting Tape (2001)
Che, G. C., Li, S. L., Ren, Z. A., Li, L., Jia, S. L., Ni, Y. M., ...
A MgB2 superconducting tape has been successfully prepared by a new way of boron diffusion into Mg tape. This tape superconductor has a Tc of 39 K with a sharp transition width of 0.4 K, high bulk...
Superconducting properties and c-axis superstructure of Mg1-xAlxB2 (2001)
Xiang, J. Y., Zheng, D. N., Li, J. Q., Li, L., Lang, P. L., Chen, H., ...
The superconducting and structural properties of a series of Mg1-xAlxB2 samples have been investigated. X-ray diffraction results confirmed the existence of a structural transition associated with...
Structural features, stacking faults, and grain boundaries in MgB2 superconducting materials (2001)
Li, J. Q., Li, L., Zhou, Y. Q., Ren, Z. A., Che, G. C., Zhao, Z. X.
The structural properties of MgB2 superconductors have been analyzed by means of convergent-beam electron diffraction, high-resolution transmission-electron microscopy, and theoretical simulations....
Flux dynamics and vortex phase diagram of the new superconductor $MgB_2$ (2001)
Wen, H. H., Li, S. L., Zhao, Z. W., Ni, Y. M., Ren, Z. A., Che, G. C., ...
Magnetic critical current density and relaxation rate have been measured on $MgB_2$ bulks from 1.6 K to $T_c$ at magnetic fields up to 8 Tesla. A vortex phase diagram is depicted based on these...
Li, S. L., Wen, H. H., Zhao, Z. W., Ni, Y. M., Ren, Z. A., Che, G. C., ...
The lower critical field $H_{c1}$ has been carefully measured on a well shaped cylindrical sample of the new superconductor $MgB_2$ fabricated by high pressure synthesis. The penetration depth...
Strong quantum fluctuation of vortices in the new superconductor $MgB_2$ (2001)
Wen, H. H., Li, S. L., Zhao, Z. W., Ni, Y. M., Ren, Z. A., Che, G. C., ...
By using transport and magnetic measurement, the upper critical field $H_{c2}(T)$ and the irreversibility line $H_{irr}(T)$ has been determined. A big separation between $H_{c2}(0)$ and $H_{irr}(0)$...